chore(rln-relay): integrate waku-org/waku-rln-contract

[rymnc]

Background

Since waku will run their own version of the rln contract for the first waku public network, to make integration easier, we need to ensure that the tests use the appropriate contract bytecode.

Details

Use https://waku-org/waku-rln-contract as a submodule, and fetch the bytecode from the deployed contracts for unit tests

Acceptance criteria

A list of tasks that need to be done for the issue to be considered resolved.

• [ ] waku-rln-contract is a submodule in nwaku
• [ ] the bytecode is fetched instead of manually copying it over each time we iterate on the contract
• [ ] the address is fetched from the allDeployments.json file, making the --rln-relay-eth-contract-address optional

[rymnc]

cc: @jm-clius for a thumbs up before I start working on this! :)

[vpavlin]

Is the node operator expected to specify a chainId (to find the right contract address from allDeployments.json?

When you say fetched, do you mean from the submodule or from the blockchain node?

[rymnc]

1. we'll have a sensible default set up, but yes, we'll have to ask them to pass in a chain name where we have mappings to the appropriate chain id

2. fetched from the submodule :)

[jm-clius]

Sounds reasonable to me. 👍